/*
 * Copyright 2011 TTOT
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package ttot.extensionmanager.impl;

import java.lang.reflect.Field;

import com.google.inject.Inject;

import ttot.extensionmanager.api.ExtensionManager;
import ttot.extensionmanager.api.InstanceProvider;

/**
 * Default implementation for the {@link InstanceProvider} interface. Provides
 * Object instances for the specified fields using the bindings from the loaded
 * extension modules.
 * 
 * @author bogdan@krax.ro
 * 
 */
public class InstanceProviderImpl implements InstanceProvider {

	private ExtensionManager extensionManager;

	@Inject
	InstanceProviderImpl(ExtensionManager extensionManager) {
		this.extensionManager = extensionManager;
	}

	/**
	 * Provides an Object instance for the specified field using the bindings
	 * from the loaded extension modules. It uses the extension injector that is
	 * created when the extensions are loaded.
	 * 
	 * @param field
	 *            - the {@link Field} to provide instance for
	 * @return {@link Object} - an instance for the provided field
	 */
	public Object provideFor(Field field) {
		return extensionManager.getExtensionInjector().getInstance(field.getType());
	}

}
